Is a 5mW Laser Powerful? 4 Laser Classes ... - Pointer Clicker
Lasers in this class range from 5 to 499 mW in power output. Besides the possibility of causing damage to the human eye, Class 3B lasers can heat up your skin and possibly burn at higher output levels. Protective eyewear is a must when handling lasers in this class. It is also recommended for the laser to have a key switch and safety lock.